Dds is used to achieve fine resolution , while injection phase lock circuit is used to realize low phase noise high performance input reference frequency Dds用于实现小步进,而注入锁相电路则用来产生低相噪的高性能参考源。
The equivalent cavity model is used to deduce the threshold condition of the ecld , and the expression of the threshold carrier density n ( v ) when ecld is tuned to oscillate at different frequencies has been obtained . using the expression of n ( v ) and the carrier dependent refractive index , the simple basic equation describing the bistable characteristics has been derived after choosing an appropriate reference frequency nf 通过建立等效腔模型来推导外腔半导体激光器的阈值条件,得到ecld在不同频率v振荡所需的阈值载流子密度n ( v )表达式,利用该表达式及相关的折射率表达式,在选择合适的参考载流子密度n _ f后,导出了一个描述双稳所需的基本方程。
Analog temperature compensation crystal oscillator ( atcxo ) is widely used in electronic equipments such as communications , navigation , radar , mobile telephone , program control telephone , measure instruments etc . as their reference frequency source , it is critical part of the above equipments , called as their “ heart ” 模拟温度补偿晶体振荡器( atcxo )广泛应用于通信、导航、雷达、移动通信、程控电话、测量仪器等电子设备中。作为基准频率源,它是上述电子设备的关键部件,被称为此类电子设备的“心脏” 。
reference: n. 1.(对委员、审查人等的)委托;委托项目[范围]。 ...frequency: n. 1.屡次,频仍,频繁。 2.(脉搏等的)次数,出现 ...frequency of reference: 引用频率frequency reference: 参考频率; 基准频率reference-frequency: 基准频率atomic frequency reference: 原子基准频率atomic resonance frequency reference: 原子谐振频率标准baseband reference frequency: 基带基准频率reference frequency multiplier: 基频倍加器; 基准倍频器; 基准频率倍增器standard reference frequency: 标准参考频率by reference: 传地址by-reference: 按引用for reference: 备案, 参考; 提交参考;以供参考; 以供参考;以资参考;作为参考资料; 作参考in reference to: 根据; 关于,就reference: n. 1.(对委员、审查人等的)委托;委托项目[范围]。 2.说到,论到,提到。 3.参考;参考书;附注,引证;基准,依据;关系。 4.(关于人品、能力等的)查询,咨询,询商;可供查问的人;证明人,介绍人;(身份、能力等的)证明书,介绍书,服务经历,鉴定书。 5.参看符号〔如 asterisk[*e], obelisk ?, section§, parallel‖, paragraph π等〕 (=reference marks)。 the commission's terms of reference 委员会的职权。 R- was made to me. 提到了我;所指的是我。 You make no reference to your plan in your letter. 你信里没有提到你的计划。 a book of reference=a reference book 参考书。 Who are your references 你的证明人都是谁? bear reference to =have reference to. give a reference to 提到,介绍。 have reference to 和…有关系。 in reference to 关于。 load one's pages with references (在著作中)引用大量参考资料[文献]。 make reference to 说到,涉及,提到;参考;查问;介绍。 with reference to 关于。 without reference to 不管,不论(without reference to age or sex 无论男女老少)。 vt. 加注,附加注脚;给(书等)列出参考书目[注明资料来源]。 reference no: 参考编号; 证书编号reference to: 对…的反映; 提到; 提及,参考with reference to: 关于..; 关于,根据; 关于,有关; 关于;有关reference of reference: 基准的基准frequency: n. 1.屡次,频仍,频繁。 2.(脉搏等的)次数,出现率;频度;【物理学】频率,周率。 audio frequency音频。 a high [low] frequency高[低]频。 the frequency of earthquakes in Japan 地震在日本的频繁发生。 mean [median] frequency中频。 resonance [resonant] frequency谐振频率,共振频率。 ultrahigh frequency超高频。 ultralow frequency超低频。 very high frequency甚高频。 very low frequency甚低频。 5 reference: 5伏基准电压源86.a reference: 一张使用说明书a book of reference: 一本参考书absolute reference: 绝对参考; 绝对基准; 绝对引用addre reference: 地址引用